<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button style="background-color: pink;
  font-size: 30px;"
  onclick="alert('大家好，我是坤哥')"
  >
    坤坤
  </button>
</body>
</html>